Core for electrical machines



(No Model.)

G. WESTINGHOUSE. CORE FOR ELECTRICAL MACHINES. No. 582,494. Patented May11,1897.

-4mummmmummur1:r u u a UNITED STATES PATENT OFFICE.

GEORGE \VESTINGHOUSE, OF PlT'SBURG, PENNSYLVANIA.

CORE FOR ELECTRICAL MACHENES.

SPECIFICATION forming part of Letters Patent No. 582,494, dated May 11,1897.

Application filed January ,189'7. Serial No. 619,898. No model.)

To ctZZ whom it may concern.-

Be it known that I, GEORGE WESTING- I-IOUSE, a citizen of the UnitedStates, residing at Pittsburg, in the county of Allegheny and State ofPennsylvania, have invented a new and useful Improvement in Cores forElectrical Machines, (Case No. 724,) of which the following is aspecification.

My invention relates to electric generators and motors, and hasparticular reference to the construction of the cores of such machines.

The object of my invention is to provide a simple, inexpensive, andefficient means whereby the laminae of the cores of electrical machinesmay be fastened together and to the casting constituting the support forsuch lamime.

Prior to my invention it was the usual practice to clamp the laminaeforming part-s of the cores of electrical machines together by means ofend plates or rings and bolts passing through said parts. Suchconstruction was open to objection by reason of the number and weight ofthe parts employed, as well as on account of the labor and expenseinvolved in manufacturing and assembling the said parts.

Myinvention is intended to overcome such objections and at the same timeto materially improve the appearance of the machine and guard againstany possibility of accidental displacement of the parts after they havebeen once assembled.

In the accompanying drawings, Figure 1 is a vertical sectional View ofthe core and casin g of the stationary member of an in ductionmotorconstructed in accordance with my in- Vention. Fig. 2 is a similar viewof the rotatable member of a generator or motor constructed inaccordance with my invention. Figs. 3 and at are detail sectional viewsof my fastening means and the adjacent cooperating parts.

Reference being now had to Fig. 1 of the drawings, 1 is a castingprovided with a cylindrical inner periphery and at or near one end withan inwardly-projecting circumferential flange 2. For convenience ofconstruction it will probably be found expedient and desirable to makethis part 2 as a single continuous flange, but I desire it to beunderstood that a plurality of lugs or fingers arrangedeircumferentially may be employed in lieu of the continuous flange shownwithout departing from my invention. At or near the other end of thecasting, on the inner side, I provide a circumferential groove 3, thusforming a shoulder 4t.

5 is an annular plate the external periphery of which is substantiallythe same as that of the inner periphery of the casting 1, and thisexternal periphery is provided with a groove 6. A plurality of openings7, the number of which is immaterial, are located at or near to the edgeof the plate 5 and extend inwardly from its outer side to the groove 6.

.8 are laminae provided with transverse slots or grooves forthereception of coils, asis usual in such machines.

10 is a ring, preferably of fusible metal, located partially in thegroove 3 in the casting and partially in the groove 6 in the annularplate 5 and serving to hold the plate 5 in such position as to clamp thelamina- 8 between it and the circumferential flange 2.

The parts are preferably assembled in the following manner: The laminzeare first assembled in proper relation with respect to each other andresting upon the flange 2. The plate 5 is then placed upon the outerplates and clamped by any suitable means in the position shown in thedrawings. Molten Babbitt metal or other fusible metal suitable for thepurpose is then poured through the openings 7 into the grooves 3 and G,where it quickly solidifies to form the ring 10. The clamping devicesmay then be removed, and the parts will be securely fastened inposition, as will be readily understood.

If it is desired for any purpose to dismember the core, the ring 10 maybe removed by subjecting the structure to sufficient heat to melt themetal of which the ring is composed.

11 are the end caps of the motor, one being shown in section and theother in side elevation.

In the construction shown in Fig. 2 the castin g 1 is provided with acylindrical outer pcriphery and ator near one end with anoutwardly-projecting circumferential flange 2, which, as was explainedin connection with the construction shown in Fig. 1, may if desired, bein the form of a number of projecting lugs or fingers, although a singlecontinuous flange will probably be more desirable in practice. In thisconstruction the inner periphery of the annular plate 5 fits over theouter periphery of the core 1 and is provided with a groove 6 and withlateral openings 7 leading thereto. The core 1 is also provided with acircumferential groove 3. The metal fastening-ring 10 is constructed andoperates in the same manner as the ring 10. (Shownin Fig. 1.) Theassembling of the laminze S and the method of clamping the same togetherand to the casting are the same as has already been described.

I desire it to be understood that my invention is not limited to thespecific details of construction and arrangement of parts shown anddescribed, since they may be modified in many particulars withoutdeparting from the spirit and scope of the invention, which is intendedto cover, broadly, a clamping means for the laminte of cores ofelectrical machines embodying a fastening-ring interposed be tween someportion of an annular clampingplate at or near one end and a flange orflanges at or near the other end of the casting, which constitutes themain support for the laminze.

I claim as my invention 1. A core for electrical machines coinpris in ga casting having a cylindrical surface and provided with alaterally-projecting flange at or near one end and with acircumferential groove at or near the other end, an annular plate havinga circumferential groove, laminze clamped between said annular plate andthe flange on the casting and a fastening-ring located partially in thecircumferential groove in the casting and partially in the correspondinggroove in the annular plate.

2. A core for electrical machines comprising a casting having acylindrical periphery and provided at or near one end with alaterally-proj ecting flange and at or near the other end with acircumferential groove, an annular plate provided with a circumferentialgroove, laminae clamped between said annular plate and the flange on thecasting and a soft-metal fastening-ring located partiallyin the groovein the casting and partially in the groove in the annular plate.

3. A core for electrical machines comprisin g a casting having acylindrical surface and provided with a laterally-projecting flange ator near one end and a circumferential shoulder of less diameter at ornear the other end, an annular plate of such diameter as to lit thecasting, laminae clamped between the annular plate and the flange on thecasting and a fastening-ring interposed between the annular plate andthe circumferential shoulder on the casting.

4. A core for electrical machines comprising a casting having acylindrical surface, laminae supported thereby, an annular clamping-plate and a fastening-ring interposed between said clamping-plateand a shoulder on the casting.

In testimony whereof I have hereunto subscribed my name this 19th day ofJanuary, A. D. 1897.

.tEO. \VES'llNGllOUSE.

\Vitncsses:

\YEsLEY G. CARR, ll'u'enirr U. TENER.

